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Raster Data

Georeference, analyze and transform gridded data

Functions

maprefcells Reference raster cells to map coordinates
maprefpostings Reference raster postings to map coordinates
georefcells Reference raster cells to geographic coordinates
georefpostings Reference raster postings to geographic coordinates
georasterref Construct geographic raster reference object
maprasterref Construct map raster reference object
makerefmat Construct affine spatial-referencing matrix
refmatToGeoRasterReference Referencing matrix to geographic raster reference object
refmatToMapRasterReference Referencing matrix to map raster reference object
refmatToWorldFileMatrix Convert referencing matrix to world file matrix
refvecToGeoRasterReference Referencing vector to geographic raster reference object
worldFileMatrixToRefmat Convert world file matrix to referencing matrix
geopeaks Generate synthetic data set on sphere
geocontourxy Contour grid in local system with latitude-longitude results
geoloc2grid Convert geolocated data array to regular data grid
imbedm Encode data points into regular data grid
ltln2val Extract data grid values for specified locations
mapoutline Compute outline of georeferenced image or data grid
resizem Resize regular data grid
limitm Determine latitude and longitude limits of regular data grid

Classes

map.rasterref.MapCellsReference Reference raster cells to map coordinates
map.rasterref.MapPostingsReference Reference raster postings to map coordinates
map.rasterref.GeographicCellsReference Reference raster cells to geographic coordinates
map.rasterref.GeographicPostingsReference Reference raster postings to geographic coordinates

Examples and How To

Generate Shaded Relief Map using Raster Data

This example shows how to generate a shaded relief map using raster data, also known as a data grid.

Determine Area Occupied by Logical Grid Variable

This example shows how to determine the area satisfying one or more conditions using logical grid manipulations.

Compute Elevation Profile Along Straight Line

This example shows how to compute an elevation profile along a straight line using the mapprofile function.

Compute Gradient, Slope, and Aspect from Regular Data Grid

This example shows how to compute the gradient, slope, and aspect for a regular data grid.

Define Geolocated Data Grid

A geolocated data grid is defined by three matrices giving latitude and longitude coordinates and indices associated with the mapped region.

Constructing a Global Data Grid

Imagine an extremely coarse map of the world in which each cell represents 60º.

Computing Map Limits for Regular Data Grids

The latitude and longitude limits of a regular grid are among the most important properties of its referencing object.

Geographic Interpretation of Grid Cells

You can access and manipulate gridded geodata using either geographic or intrinsic raster coordinates.

Precompute the Size of a Data Grid

Before making a large, memory-taxing data grid, you should first determine what its size will be.

Concepts

Raster Geodata

Raster geodata represents map data in matrix format.

Data Grids as Logical Variables

Perform logic tests on data grid variables to create a binary logical grid.

Types of Data Grids and Raster Display Functions

Mapping Toolbox™ functions and GUIs display both regular and geolocated data grids originating in a variety of formats.

Geographic Interpretations of Geolocated Grids

The dimensions of a map matrix and associated latitude and longitude matrices determines the interpretation of the geographic map data.

Georeferenced Raster Data

Structure and application of referencing vectors and referencing matrices

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